Perforated rubber laundry bag



L L E N m s E A PERFORATED RUBBER LAUNDRY BAG 2 Sheets-Sheet 1 Original Filed Jan. 21, 1941 Fuse 1 INVENTOR- E -5idnc: ll

Albcmt Ap 13, 1948. sm E PERFORATED RUBBER LAUNDRY BAG Original Filed Jan. 21, 1941 2 Sheets-Sheet 2 [N VENTOR.

E 5idnll A ina-rt Patented Apr. 13, 1948 UNITED STATES PATENT OFFICE PERFORA TED RUBBER LAUNDRY BAG Albert E. Sidnell, Akron, Ohio, assignor to Seiberling Latex Products Company, Barberton, Ohio,

a corporation of Ohio Application January 21, 1941, Serial No. 375,145, which is a division of application Serial No. 272,586, May 9, 1939. Divided and this applica- 1 Claim.

of the bag along these edges while the bag is in a service.

These and other objects of the invention will be manifest from the following brief description and the accompanying drawings.

This application is a division of application Serial Number 375,145,'filed January 21, 1941, which has matured into Patent 2,346,335. Said application was, in turn, a division of application Serial Number 272,586, filed May 9, 1939, which matured into Patent 2,286,117.

Of the accompanying drawings:

Figure 1 is a transverse cross-section, partly broken away, through a mold as used for vulcanizing an improved laundry bag embodied in the invention.

Figure 2 is an enlarged fragmentary cross section taken on line 2-2 of Figure 1.

Figure -3 is a view showing a portion of a, bag which has been removed from the mold after vulcanization thereof and turned wrong-side out to expose the nubs formed at the perforations during vulcanization.

Figure 4 is an enlarged cross-section taken on line 44 of Figure 3.

Figure 5 is a perspective view illustrating the manner of mounting the bag while still wrongside out, for removal of the nubs.

Figure 6 is an enlarged fragmentary crosssection taken on line 6-6 of Figure 5.

Figure '7 is a plan view of a finished bag in right-side-out condition.

Figure 8 is an enlarged cross-section taken on line 8--8 of Figure 7.

Referring to Figures 1 and 2 of the drawings, the numeral l0 designates the lower section, II the upper section, and I2 the intermediate section or core of a laundry bag mold. The manner of utilizing this mold for shaping plastic sheet rubber therein to provide a laundry bag or like article is well-known in the art.

The respective mold sections preferably are designed to form substantially flat bags l3 having the adjacent walls thereof relatively close together so as to reduce the thickness of the core, and hence the weight thereof, thereby facilitating more efllcient handling of the core by press operators. To prevent splitting of bag l3 along the edge portions thereof, as described, the retion June 23, 1943, Serial No. 491,868

spective mold sections preferably are designed to form enlarged head or rounded edge portions about the bag, as indicated at 14 (see Figure 1). The surfaces of the rounded portions M of the core may merge or taper into-the flat surfaces thereof with a relatively large radius, so that the edge portions of the bag will merge smoothly into the closely adjacent flat walls thereof. Thus the core l2 may be of relatively thin, light weight construction and yet form rounded edge portions of large radius on the bag for the purpose above referred to.

For forming perforations in the bag, the upper and lower sections II and 10 may be provided with a plurality of pins l5, l5 which project from the inner faces of said sections, the projecting ends of the pins being arranged to be received in correspondingly arranged recesses l6, It in opposite sides of core 12, when the sections are in the relation shown in Figures 1 and 2. A very slight clearance is allowed between pins 15 and the sides of recesses I6, the clearance best suited for the present purposes having been found to be approximately .005 inch. Also, when the sections are in the press-closed positions thereof, there preferably is allowed a substantially greater clearance between the ends of the pins l5 and the bottoms of holes [6 suflicient to receive the rubber pushed out of the side-walls of bag I3 in forming perforations l1, l1 therein. This arrangement is such that relatively thick nubs l9, l9 formed in the vulcanizing process are connected to bag Is at the edges of the perforations [1 only by a very thin film or web of rubber [9a, so that the nubs may readily be detached to leave the perforations with substantially clean, smooth edges, as will be subsequently described.

Mold sections In and lLmay be provided with grooves 011 the inner faces thereof surrounding pins l5, so that rubber will be pressed into the grooves during the vulcanizing step to form continuous reinforcing ribs "a about edges adjacent the perforations.

Longitudinal grooves 20, 20'may be provided on both sides of core 12, the grooves on one side preferably extending angularly of those on the other side, so as to produce similarly angularlydisposed ribs 2|, 2! on the inside faces of the bag. These ribs 2|, besides reinforcing the bag, prevent the sides of the bag from sticking together.

As best shown in Figures 5 and 6, after the bag l3 has been removed from the vulcanizing mold it is turned wrong-side-out to present nubs l9 to the exterior thereof and then it is stretched over a suitable flat board or form 22. By rubbing a the perforations.

, 3 suitable straight edged tool or scraper or knife 23 over the suriaces or the bag to engage under nubs It, the latter may rapidly be separated from the bag, by virtue oi the thin web as being easily disrupted or torn away from the bag adjacent When the nubs I 9 have been removed from both sides 01' the bag It, the latter is turned right-side-out to present to the interior or the bag the reinforcing rib i'ia which encircles the edge of each perforation on one surface of the bag, as shown in Figures 7 and 8. When the bag is in use, its contents distend the bag at the perforations, and the reinforcing ribs ila withstand the abrasion to which the outside edges of the perforations are then subjected.

Modifications of the invention may be resorted to without departing from the spirit thereof or the scope or the appended claim.

What is claimed is:

A molded laundry or like bag or vulcanized elastic or resilient material which unfilled has spaced, fiat, flexible walls with perforations throughout a large portion of the body thereof,

- The following references are 01 record in the,

being rounded on a s tance between the radius e'reatJ- than the diswalls when the bagis not ALBERT E. SIDNELL.

REFERENCES CITED file of this patent:

UNITED STATES PATENTS Number Number each perforation being reinforced around the 25 306,330

Name Date Little Nov. 7, 1933 Spanel Oct. 29, 1935 Dickey Dec. 15, 1936 Spanel Nov. 30, 1937 Vadnais Dec. 17, 1940 Coe et al. Mar. 25, 1941 FOREIGN PATENTS Col'ntry 'Date Great Britain Feb. 21, 1929 

